<?php

if (!defined('BASEPATH'))
  exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */
// ------------------------------------------------------------------------

/**
 * CodeIgniter CAPTCHA Helper
 *
 * @package		CodeIgniter
 * @subpackage	Helpers
 * @category	Helpers
 * @author		ExpressionEngine Dev Team
 * @link		http://codeigniter.com/user_guide/helpers/xml_helper.html
 */
// ------------------------------------------------------------------------

/**
 * Create CAPTCHA
 *
 * @access	public
 * @param	array	array of data for the CAPTCHA
 * @param	string	path to create the image in
 * @param	string	URL to the CAPTCHA image folder
 * @param	string	server path to font
 * @return	string
 */
if (!function_exists('create_captcha')) {

  function create_captcha($data = '', $img_path = '', $img_url = '', $font_path = '') {
    $defaults = array('word' => '', 'img_path' => '', 'img_url' => '', 'img_width' => '150', 'img_height' => '30', 'font_path' => '', 'expiration' => 7200);

    foreach ($defaults as $key => $val) {
      if (!is_array($data)) {
        if (!isset($$key) OR $$key == '') {
          $$key = $val;
        }
      } else {
        $$key = (!isset($data[$key])) ? $val : $data[$key];
      }
    }

    if ($img_path == '' OR $img_url == '') {
      return FALSE;
    }

    if (!@is_dir($img_path)) {
      return FALSE;
    }

    if (!is_writable($img_path)) {
      return FALSE;
    }

    if (!extension_loaded('gd')) {
      return FALSE;
    }

    // -----------------------------------
    // Remove old images
    // -----------------------------------

    list($usec, $sec) = explode(" ", microtime());
    $now = ((float) $usec + (float) $sec);

    $current_dir = @opendir($img_path);

    while ($filename = @readdir($current_dir)) {
      if ($filename != "." and $filename != ".." and $filename != "index.html") {
        $name = str_replace(".jpg", "", $filename);

        if (($name + $expiration) < $now) {
          @unlink($img_path . $filename);
        }
      }
    }

    @closedir($current_dir);

    // -----------------------------------
    // Do we have a "word" yet?
    // -----------------------------------

    if ($word == '') {
      $pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';

      $str = '';
      for ($i = 0; $i < 8; $i++) {
        $str .= substr($pool, mt_rand(0, strlen($pool) - 1), 1);
      }

      $word = $str;
    }

    // -----------------------------------
    // Determine angle and position
    // -----------------------------------

    $length = strlen($word);
    $angle = ($length >= 6) ? rand(-($length - 6), ($length - 6)) : 0;
    $x_axis = rand(6, (360 / $length) - 16);
    $y_axis = ($angle >= 0 ) ? rand($img_height, $img_width) : rand(6, $img_height);

    // -----------------------------------
    // Create image
    // -----------------------------------
    // PHP.net recommends imagecreatetruecolor(), but it isn't always available
    if (function_exists('imagecreatetruecolor')) {
      $im = imagecreatetruecolor($img_width, $img_height);
    } else {
      $im = imagecreate($img_width, $img_height);
    }

    // -----------------------------------
    //  Assign colors
    // -----------------------------------

    $bg_color = imagecolorallocate($im, 255, 255, 255);
    $border_color = imagecolorallocate($im, 153, 102, 102);
    $text_color = imagecolorallocate($im, 204, 153, 153);
    $grid_color = imagecolorallocate($im, 255, 182, 182);
    $shadow_color = imagecolorallocate($im, 255, 240, 240);

    // -----------------------------------
    //  Create the rectangle
    // -----------------------------------

    ImageFilledRectangle($im, 0, 0, $img_width, $img_height, $bg_color);

    // -----------------------------------
    //  Create the spiral pattern
    // -----------------------------------

    $theta = 1;
    $thetac = 7;
    $radius = 16;
    $circles = 20;
    $points = 32;

    for ($i = 0; $i < ($circles * $points) - 1; $i++) {
      $theta = $theta + $thetac;
      $rad = $radius * ($i / $points );
      $x = ($rad * cos($theta)) + $x_axis;
      $y = ($rad * sin($theta)) + $y_axis;
      $theta = $theta + $thetac;
      $rad1 = $radius * (($i + 1) / $points);
      $x1 = ($rad1 * cos($theta)) + $x_axis;
      $y1 = ($rad1 * sin($theta)) + $y_axis;
      imageline($im, $x, $y, $x1, $y1, $grid_color);
      $theta = $theta - $thetac;
    }

    // -----------------------------------
    //  Write the text
    // -----------------------------------

    $use_font = ($font_path != '' AND file_exists($font_path) AND function_exists('imagettftext')) ? TRUE : FALSE;

    if ($use_font == FALSE) {
      $font_size = 5;
      $x = rand(0, $img_width / ($length / 3));
      $y = 0;
    } else {
      $font_size = 16;
      $x = rand(0, $img_width / ($length / 1.5));
      $y = $font_size + 2;
    }

    for ($i = 0; $i < strlen($word); $i++) {
      if ($use_font == FALSE) {
        $y = rand(0, $img_height / 2);
        imagestring($im, $font_size, $x, $y, substr($word, $i, 1), $text_color);
        $x += ($font_size * 2);
      } else {
        $y = rand($img_height / 2, $img_height - 3);
        imagettftext($im, $font_size, $angle, $x, $y, $text_color, $font_path, substr($word, $i, 1));
        $x += $font_size;
      }
    }


    // -----------------------------------
    //  Create the border
    // -----------------------------------

    imagerectangle($im, 0, 0, $img_width - 1, $img_height - 1, $border_color);

    // -----------------------------------
    //  Generate the image
    // -----------------------------------

    $img_name = $now . '.jpg';

    ImageJPEG($im, $img_path . $img_name);

    $img = "<img src=\"$img_url$img_name\" width=\"$img_width\" height=\"$img_height\" style=\"border:0;\" alt=\" \" />";

    ImageDestroy($im);

    return array('word' => $word, 'time' => $now, 'image' => $img);
  }

}

// ------------------------------------------------------------------------

/* End of file captcha_helper.php */
/* Location: ./system/heleprs/captcha_helper.php */